Improvement in furnace-grate bars



R,- G. GRAVES.

Furnace Grate-Bars.

Paiented Feb. 11,1873.

mvimon.

WITNESSES.

v UNITED STATES ROBERT o. GRAVES, OF'BARNESVILLE, OHIO.

IMPROVEMENT IN FURNACE-GRATE BARS.

Specification forming part of Letters Patent No. 135,799, dated February 11, 1873.

To all whom it may concern:

Be it known that I, ROBERT C. GRAVES, of Barnesville, in the county of Belmont and State of Ohio, have invented a new and valuable Improvement in Furnace-GrateBars 5 and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawing making a part of this specification, and to the letters and figures of reference marked thereon.

Figure l of the drawing is a representation of a transverse vertical section of the grate, and Fig. 2 is a longitudinal section through the middle rib of the grate-bar.

This invention has relation to furnacegrates; and it consists in the construction and novel arrangement of the triple gratebars with unequal ribs, and the recessed reciprocating bar for actuating the same, whereby a sufficient amount of play is allowed in the agitation of the grate-bars, while the re ciprocating actuating-bar is brought up close under the grate, all as hereinafter described.

Referring to the drawing, A a designate the grate-bars, cast in sets of three, which are connected together at their ends by cross-pieces, from which project pivots b, fitting sockets in the front and. back bars B B of the grateframe. The bars A have their middle parts constructed with depending portions or lugs O, to fit between studs con the upper surface of a transverse bar, D, which is hinged to the two outer barsof the series A, or may be hinged to all. To this bar is pivoted a lever, E, which extends to the front of the grate, and is fulcrumed on a depending standard, F.

The grate-bars are rocked from side to side by properly vibrating the lever E, and are limited in their movement by the inner surfaces of the studs 0, which are beveled, as shown, and which prevent the bars from turning over and allowing the fuel to fall out.

It will be noticed that the side bars a do not extend down so far as the middle bars A, and that the reciprocating bar D is cut away or recessed under said side bars, the object being to provide space forthe oscillation of the grate-bars.

What I claim as new is- The oscillating grate-bars constructed in sets of three, having the side bars a of less depth than the middle bar A,as shown, in combination with. the reciprocating bar D, constructed with recesses to allow limited play to the bars a, substantially as specified.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

ROBERT (J. GRAVES.

Witnesses:

J. E. ELLIS, B. F. MAcKALL.

Plgrnlvr OFFICE. 

